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Merb Slice that adds basic activation functionality to merb-auth.
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This slice provides a check to make sure that a user is active on login. It also provides
activation on the “user” object via an activation action (slice_url :activate). When loggin in,
the “user” object found by merb-auth-core will be asked

Do you respond_to?(:active?):

  1. If yes, check if active and return the user if they are
  2. If no, return the user (i.e. no activation check)

This slice adds a mixin that you should include in your user model to priovide the active? method.
The mixin will automatically select the correct sub mixin for all supported orms.

class User
  include DataMapper::Resource
  include Merb::Authentication::Mixins::ActivatedUser

  property :id,    Serial

The mixin provides a number of methods. The most common are:

  @user.activate!   # activates (and saves) the user
  @user.activated?  # Returns the "active" status of the user     # Alias for activated?

Migration Requirements

The mixin requires some fields to be in-place on your model. Where needed include these in your migrations.

  :activated_at,    DateTime
  :activation_code, String


The slice contains 2 mailing actions that are setup as callback hooks on the model. When the model is created
a “signup” email is sent with the link to follow to activate the account. Also an activation acknowledgment

Configuration Options

These options may be declared in your init.rb or environment/*.rb files

Use the standard slice configuration hash to set these up Merb::Slices::config[:'merb-auth-slice-activation']


:from_email # The email account to send the email from
:activation_host # The host to go to for activation. This is used to construct the

  1. activation link. Symbol, String or Procs are available.
  2. Procs will have the user object passed in


:welcome_subject # The subject of the email to send after activation (Welcome)
:activation_subject # The subject of the email sent to ask for activation

Customizing the emails

To customize your emails, rake the slices stubs

	$ rake slices:merb-auth-slice-activation:stubs

This will create stubs of the views in slices/merb-auth-slice-activation/app/mailers/views/

To create HTML emails just add an html template like signup.html.erb

Customize the Redirect after activation

rake the slices stubs as above. There is an activations.rb controller in the
slices/merb-auth-slice-activation/app/controllers directory. You can overwrite the stubbed
method in there to have it change it’s redirection behavior.

  1. Rake tasks to package/install the gem – edit this to modify the manifest.
  2. The slice application: controllers, models, helpers, views.
  3. The default layout, as specified in Merb::Slices::config[:'merb-auth-slice-activation'][:layout] change this to :application to use the app’s layout.
  4. Standard rake tasks available to your application.
  5. Your custom application rake tasks.
  6. The main slice file – contains all slice setup logic/config.
  7. Public assets you (optionally) install using rake slices:merb-auth-slice-activation:install
  8. Specs for basis slice behaviour – you usually adapt these for your slice.
  9. Stubs of classes/views/files for the end-user to override – usually these mimic the files in app/ and/or public/; use rake slices:merb-auth-slice-activation:stubs to get started with the override stubs. Also, rake slices:merb-auth-slice-activation:patch will copy over views to override in addition to the files found in /stubs.

To see all available tasks for MerbAuthSliceActivation run:

	$ rake -T slices:merb-auth-slice-activation

Instructions for installation:

file: config/init.rb

  1. add the slice as a regular dependency

dependency ‘merb-auth-slice-activation’

  1. if needed, configure which slices to load and in which order

Merb::Plugins.config[:merb_slices] = { :queue => [“MerbAuthSliceActivation”, …] }

  1. optionally configure the plugins in a before_app_loads callback

Merb::BootLoader.before_app_loads do

Merb::Slices::config[:merb-auth-slice-activation][:option] = value


file: config/router.rb

  1. example: /merb-auth-slice-activation/:controller/:action/:id


  1. example: /foo/:controller/:action/:id

add_slice(:MerbAuthSliceActivation, ‘foo’) # same as :path => ‘foo’

  1. example: /:lang/:controller/:action/:id

add_slice(:MerbAuthSliceActivation, :path => ‘:lang’)

  1. example: /:controller/:action/:id


Normally you should also run the following rake task:

rake slices:merb-auth-slice-activation:install

You can put your application-level overrides in:

host-app/slices/merb-auth-slice-activation/app – controllers, models, views …

Templates are located in this order:

1. host-app/slices/merb-auth-slice-activation/app/views/*
2. gems/merb-auth-slice-activation/app/views/*
3. host-app/app/views/*

You can use the host application’s layout by configuring the
merb-auth-slice-activation slice in a before_app_loads block:

Merb::Slices.config[:merb-auth-slice-activation] = { :layout => :application }

By default :merb-auth-slice-activation is used. If you need to override
stylesheets or javascripts, just specify your own files in your layout
instead/in addition to the ones supplied (if any) in

In any case don’t edit those files directly as they may be clobbered any time
rake merb-auth-slice-activation:install is run.

About Slices

Merb-Slices is a Merb plugin for using and creating application ‘slices’ which
help you modularize your application. Usually these are reuseable extractions
from your main app. In effect, a Slice is just like a regular Merb MVC
application, both in functionality as well as in structure.

When you generate a Slice stub structure, a module is setup to serve as a
namespace for your controller, models, helpers etc. This ensures maximum
encapsulation. You could say a Slice is a mixture between a Merb plugin (a
Gem) and a Merb application, reaping the benefits of both.

A host application can ‘mount’ a Slice inside the router, which means you have
full over control how it integrates. By default a Slice’s routes are prefixed
by its name (a router :namespace), but you can easily provide your own prefix
or leave it out, mounting it at the root of your url-schema. You can even
mount a Slice multiple times and give extra parameters to customize an
instance’s behaviour.

A Slice’s Application controller uses controller_for_slice to setup slice
specific behaviour, which mainly affects cascaded view handling. Additionaly,
this method is available to any kind of controller, so it can be used for
Merb Mailer too for example.

There are many ways which let you customize a Slice’s functionality and
appearance without ever touching the Gem-level code itself. It’s not only easy
to add template/layout overrides, you can also add/modify controllers, models
and other runtime code from within the host application.

To create your own Slice run this (somewhere outside of your merb app):

$ merb-gen slice

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